Notable for its perfect circular design, Restormel Castle is one of the oldest and best preserved Norman motte-and-bailey castles in Cornwall
Before Radar, they used these giant concrete “Sound Mirrors” to detect incoming enemy aircraft
Rabbit hole in farmer’s land leads to a network of caves reportedly used by Knights Templar
The 10,000 room Nazi resort complex without a single guest ever accommodated
Russian explorers unexpectedly measured high levels of radiation in abandoned bunkers
